Drag arrangement for spinning and other textile frames



Sept. 29, 1931. J. HARGROVE 1,825,061

DRAG ARRANGEMENT FOR SPINNING AND OTHER TEXTILE FRAMES Filed July 8, 1950 lNvENTuR Jill-IN HAR E-R ENE.

BY ATTURNEY Patented Sept. 29, 1931 ,t

UNITED STATES JOHN 'HAneRovnor MoNIEIn'rn; aneusfseortaivnl DRAG ARRANGEMENT ron SPI NING x1511)treatre n me ts--;

Application filed. mg 8; 1930, Serial No; 466,410, than a ea imam September 6, i939;

This invention relates to an improved drag arrangement applicable to spinning,

twisting and other textile frames in which a bobbin is rotated by the pull of yarn.

In connection with spinning and other textile frames in which the bobbin-is driven frictionally by the spindle it has been proposed to apply a controllable drag to the bobbin by means of an eddy-current brake, comprising, say, a disc of copper rotating between the poles of an electro-magnet. As the friction between the bobbin and the spindle is an indeterminate quantity, the same variation of the current supplied to a set of electro-magnets will not produce like drag effects on a set of bobbins.

Again, in those spinning or like framesin which the bobbin is rotated by the pull of yarn it has been the practice to employl a bobbin spindle of either one of two types, namely a stationary spindle on which the, bobbin rotates, or a spindle rotating at the same speed as the flyer. In both cases fric-; tion is set up betweenthe bobbin and the spindle. Where a stationary or dead spindle is employed, the bobbin must travel at a high speed relatively to the spindle, so that there is marked friction between the spindle and the bobbin which varies according to the condition of the spindle and the bobbin. Where a live spindle is employed, the bobbin does not rotate at the same high speed as the spindle, so that in thiscase also, owing to the dilference of speed between the bobbin and the spindle, there is to be' overcome frictional resistance which varies according to the condition of the bobbin and the spindle;

The conditions above indicated are, 'to say the least, not the optimum conditions for spinning, twisting, winding or the like, owing to the indeterminate and varying friction between the bobbin and the spindle.

In these cases also drag arrangementscan-- not be expected to-produce uniform efi'ects under such variable conditions With a view to eliminating irregularities in operation, I effect positive mechanical interconnection of the bobbin with a bobbincentering spindle as by means of pins on aflange on the spindle engaging apertures in the .base; of the bbbbin so thatthebobbin and the fspindle vrotate at exactly the same speed, and I mount the spindle in-antifriction. bearings,j*sog"that, :apart from the dragproducedbyan eddycurrent brake, the

only resistance to rotationisf that set up by V the anti-friction bearings, I

;In a set of, ball o'rroller bearingsof siniifi lar type the frictionis iapproximately the, same for each' so; that the conditions are practically 'uniform' for. allthe spindles of a group and regularity of operation 1 rendered, practicable. l 'V. 51 I; y v

The rotor of the eddy-currentbrake is fixed to thespindle andas; theb'obbin is-positively connected' with the spindle, and thus wlth saidifirotor', there is 7- lrelatiyeg slip between the; bobbin 1 and the; rotor .,of ,qthe

brake; ,i.-e. the spindle, bobbin; and. rotorrotate'as ai-unit." T

7 'The' figurei of the accompanying is a Fiverticztl :sectionioshowing a -construction-according to one embodiment fof -the invention; -V A's. shownin thfe'drawing the spindle l, on

which the bobbin '21isimpaledorecentered is provided fwith l ia; bobbin-seating o flange formed with upstanding-spins 3 -engaging sockets formed in.the baseiofthebobbinn The. flower -;exte'nsionfl 4 offqthe' spindle is mounted in ball bearings 5 inthe rail'lG.

- rSecured on; the lower vend of- :thaspindle extension 4' is a disc f8 iofinori ferrpus n etal havingIaportiGnirotatable in the gap between the opposed poles 9, 10 of an electromagnet excited by a winding 11, or it might be-of a permanent magnet, and acting as a Foucault or eddy-current brake. v

To vary the flux across the air gap in order to vary the order of the drag the airgap may be varied or the pole pieces adjusted. Again, if an electro-vmagnet is used,

'the drag eifect may be varied by varying the flow of current through the coil by inserting 'a resistance in the coil circuitor changing the. voltage of the supply, or by changing the number of turns of the coil, that is exchanging one coil for another, or by using 2100 tappings on the coil whereby the number of efi'ective turns of the coilmay be varied. It will be understood that thedrag effect is produced with a minimum of friction and without wear of the bobbin, and that with the disc and pole, pieces in given positions at a constant speed a uniform resistancetorque is set up. Obviously, since the drag-is not affected detrimentally by speed, any desired spindle speed may be selected.

In a spinning, twisting or like'frame it may be arranged. that, at the start of a spinning orlike operation, all the magnets are in like positions-of adjustment and that, during spinning, individual adjustment of the magnets can be effected to suit conditions.

12 denotes a mechanical brake for efl'ecting positive arrest of the spindle when required. i I

V It is important to note that the brake disc 8' is-fixed' to the lower end of the spindle extension 4 below 'the rail 6, so thatthe bobbin may be brought close to the spindle bearing as distinguished from prior arrangements in which the brake occupies space above the rail, interfering with the attendance and being liable to be damaged, and as distinguished from arrangements in which the brake is located in the rail so as not to be 1 readily accessible' c WhatIclaim is:-'. W V V 1A drag arrangeme 'tfor textile frames in which thebobbin is rotated by the pull of arn com risin in combination with a a P), i

- fixed spindlerail, an upright spindle jour nailed for free rotation in said rail, the lower end of-saidspindle being exposed below said rail, saidspindle having a flange formed with pins engageable with'soc kets in a bobbinimpaled on the upper portion of said spindle above said rail, a magnet having opposed-poles, one'of said poles being unitary with saidrail, and the other of said 1 poles being below said rail, and a disc of non-ferrous metal fixed to the lower end of said spindle below said rail and rotatable in the gap between said poles.

In testimony whereof I U have signed name to this specification. 5 V JJOHN A G OVE. 

